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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf84f051d3cfd4a945edae01a29065e9cd9ee1dedd8142daf1f1d1eccd840f1' 
  AND token = 'A4KUVInpcOCx3LkLrVz8ShXBRO5vb04OVjAADJ51Crc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}